The Spanish omelette is made with eggs and potatoes, often with onion, and is often served at room temperature as a tapa, a pintxo or a bar snack.
Wikipedia traces the first written reference to the tortilla to a Navarrese document of 1817 and records a legend that General Zumalacarregui invented it during the 1835 siege of Bilbao, though it is unknown whether that is true. Its Bilbao entry lists the Spanish omelette among the city's bar snacks. Sorginzulo, on Plaza Nueva, won fifth prize at the 2025 National Potato Tortilla Congress, and Baster lists individual tortillas made to order among its specialties.
